git.maemo.org Git - gonvert/blob - src/gonvert_glade.py

   1 #!/usr/bin/env python
   2 # -*- coding: UTF8 -*-
   3
   4 import os
   5 import pickle
   6 import string
   7 import sys
   8 import gettext
   9 import logging
  10
  11 import gobject
  12 import gtk
  13 import gtk.glade
  14 import gtk.gdk
  15
  16 import constants
  17 import unit_data
  18
  19
  20 _moduleLogger = logging.getLogger("gonvert_glade")
  21
  22 gettext.bindtextdomain('gonvert', '/usr/share/locale')
  23 gettext.textdomain('gonvert')
  24 _ = gettext.gettext
  25
  26
  27 def change_menu_label(widgets, labelname, newtext):
  28         item_label = widgets.get_widget(labelname).get_children()[0]
  29         item_label.set_text(newtext)
  30
  31
  32 class Gonvert(object):
  33
  34         _glade_files = [
  35                 os.path.join(os.path.dirname(__file__), "gonvert.glade"),
  36                 os.path.join(os.path.dirname(__file__), "../data/gonvert.glade"),
  37                 os.path.join(os.path.dirname(__file__), "../lib/gonvert.glade"),
  38                 '/usr/lib/gonvert/gonvert.glade',
  39         ]
  40
  41         def __init__(self):
  42                 self._unitDataInCategory = None
  43                 self._calcsuppress = False
  44                 self._unit_sort_direction = False
  45                 self._value_sort_direction = False
  46                 self._units_sort_direction = False
  47
  48                 self._find_result = [] # empty find result list
  49                 self._find_count = 0 # default to find result number zero
  50
  51                 self._selected_category = '' # preset to no selected category
  52                 self._selected_units = {} # empty dictionary for later use
  53
  54                 #check to see if glade file is in current directory (user must be
  55                 # running from download untar directory)
  56                 for gladePath in self._glade_files:
  57                         if os.path.isfile(gladePath):
  58                                 homepath = os.path.dirname(gladePath)
  59                                 pixmapspath = "/".join((homepath, "pixmaps"))
  60                                 widgets = gtk.glade.XML(gladePath)
  61                                 break
  62                 else:
  63                         return
  64
  65                 self._mainWindow = widgets.get_widget('mainWindow')
  66
  67                 change_menu_label(widgets, 'fileMenuItem', _('File'))
  68                 change_menu_label(widgets, 'exitMenuItem', _('Exit'))
  69                 change_menu_label(widgets, 'toolsMenuItem', _('Tools'))
  70                 change_menu_label(widgets, 'clearSelectionMenuItem', _('Clear selections'))
  71                 change_menu_label(widgets, 'writeUnitsMenuItem', _('Write Units'))
  72                 change_menu_label(widgets, 'helpMenuItem', _('Help'))
  73                 change_menu_label(widgets, 'aboutMenuItem', _('About'))
  74                 change_menu_label(widgets, 'findButton', _('Find'))
  75
  76                 self._shortlistcheck = widgets.get_widget('shortlistcheck')
  77                 self._toggleShortList = widgets.get_widget('toggleShortList')
  78
  79                 self._categoryView = widgets.get_widget('categoryView')
  80
  81                 self._unitsView = widgets.get_widget('unitsView')
  82                 self._unitsView_selection = self._unitsView.get_selection()
  83
  84                 self._unitName = widgets.get_widget('unitName')
  85                 self._unitValue = widgets.get_widget('unitValue')
  86                 self._previousUnitName = widgets.get_widget('previousUnitName')
  87                 self._previousUnitValue = widgets.get_widget('previousUnitValue')
  88                 messagebox = widgets.get_widget('msgbox')
  89                 messageboxtext = widgets.get_widget('msgboxtext')
  90
  91                 self._unitSymbol = widgets.get_widget('unitSymbol')
  92                 self._previousUnitSymbol = widgets.get_widget('previousUnitSymbol')
  93
  94                 self._unitDescription = widgets.get_widget('unitDescription')
  95
  96                 self._findEntry = widgets.get_widget('findEntry')
  97                 self._findLabel = widgets.get_widget('findLabel')
  98                 findButton = widgets.get_widget('findButton')
  99                 ToolTips = gtk.Tooltips()
 100                 ToolTips.set_tip(findButton, _(u'Find unit (F6)'))
 101
 102                 #insert a self._categoryColumnumn into the units list even though the heading will not be seen
 103                 renderer = gtk.CellRendererText()
 104                 self._unitNameColumn = gtk.TreeViewColumn(_('Unit Name'), renderer)
 105                 self._unitNameColumn.set_property('resizable', 1)
 106                 self._unitNameColumn.add_attribute(renderer, 'text', 0)
 107                 self._unitNameColumn.set_clickable(True)
 108                 self._unitNameColumn.connect("clicked", self._on_click_unit_column)
 109                 self._unitsView.append_column(self._unitNameColumn)
 110
 111                 self._unitValueColumn = gtk.TreeViewColumn(_('Value'), renderer)
 112                 self._unitValueColumn.set_property('resizable', 1)
 113                 self._unitValueColumn.add_attribute(renderer, 'text', 1)
 114                 self._unitValueColumn.set_clickable(True)
 115                 self._unitValueColumn.connect("clicked", self._on_click_unit_column)
 116                 self._unitsView.append_column(self._unitValueColumn)
 117
 118                 self._unitSymbolColumn = gtk.TreeViewColumn(_('Units'), renderer)
 119                 self._unitSymbolColumn.set_property('resizable', 1)
 120                 self._unitSymbolColumn.add_attribute(renderer, 'text', 2)
 121                 self._unitSymbolColumn.set_clickable(True)
 122                 self._unitSymbolColumn.connect("clicked", self._on_click_unit_column)
 123                 self._unitsView.append_column(self._unitSymbolColumn)
 124
 125                 #Insert a column into the category list even though the heading will not be seen
 126                 renderer = gtk.CellRendererText()
 127                 self._categoryColumn = gtk.TreeViewColumn('Title', renderer)
 128                 self._categoryColumn.set_property('resizable', 1)
 129                 self._categoryColumn.add_attribute(renderer, 'text', 0)
 130                 self._categoryView.append_column(self._categoryColumn)
 131
 132                 self._categoryModel = gtk.ListStore(gobject.TYPE_STRING)
 133                 self._categoryView.set_model(self._categoryModel)
 134                 #colourize each row differently for easier reading
 135                 self._categoryView.set_property('rules_hint', 1)
 136
 137                 #Populate the catagories list
 138                 keys = unit_data.UNIT_DESCRIPTIONS.keys()
 139                 keys.sort()
 140                 for key in keys:
 141                         iter = self._categoryModel.append()
 142                         self._categoryModel.set(iter, 0, key)
 143
 144                 #--------- connections to GUI ----------------
 145                 dic = {
 146                         "on_exit_menu_activate": self._on_user_exit,
 147                         "on_main_window_destroy": self._on_user_exit,
 148                         "on_categoryView_select_row": self._on_click_category,
 149                         "on_unitsView__on_click_unit_column": self._on_click_unit_column,
 150                         "on_unitValue_changed": self._on_unit_value_changed,
 151                         "on_previousUnitValue_changed": self._on_previous_unit_value_changed,
 152                         "on_writeUnitsMenuItem_activate": self._on_user_write_units,
 153                         "on_findButton_clicked": self._on_user_find_units,
 154                         "on_findEntry_key_press_event": self._on_find_key_press,
 155                         "on_findEntry_changed": self._on_findEntry_changed,
 156                         "on_aboutMenuItem_activate": self._on_about_clicked,
 157                         "on_messagebox_ok_clicked": self.messagebox_ok_clicked,
 158                         "on_clearSelectionMenuItem_activate": self._on_user_clear_selections,
 159                         "on_unitsView_cursor_changed": self._on_click_unit,
 160                         "on_unitsView_button_released": self._on_button_released,
 161                         "on_shortlistcheck_toggled": self._on_shortlist_changed,
 162                         "on_toggleShortList_activate": self._on_edit_shortlist,
 163                 }
 164                 widgets.signal_autoconnect(dic)
 165
 166                 self._mainWindow.set_title('gonvert- %s - Unit Conversion Utility' % constants.__version__)
 167                 iconPath = pixmapspath + '/gonvert.png'
 168                 if os.path.exists(iconPath):
 169                         self._mainWindow.set_icon(gtk.gdk.pixbuf_new_from_file(iconPath))
 170                 else:
 171                         _moduleLogger.warn("Error: Could not find gonvert icon: %s" % iconPath)
 172
 173                 #Restore window size from previously saved settings if it exists and is valid.
 174                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
 175                 if os.path.exists(windowDatPath):
 176                         #Retrieving previous window settings from ~/.gonvert/window.dat
 177                         saved_window = pickle.load(open(windowDatPath, "r"))
 178                         #If the 'size' has been stored, then extract size from saved_window.
 179                         if 'size' in saved_window:
 180                                 a, b = saved_window['size']
 181                                 self._mainWindow.resize(a, b)
 182                         else:
 183                                 #Maximize if no previous size was found
 184                                 #self._mainWindow.maximize()
 185                                 pass
 186                 else:
 187                         #Maximize if no previous window.dat file was found
 188                         #self._mainWindow.maximize()
 189                         pass
 190
 191                 #Restore selections from previously saved settings if it exists and is valid.
 192                 historical_catergory_found = False
 193                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 194                 if os.path.exists(selectionsDatPath):
 195                         #Retrieving previous selections from ~/.gonvert/selections.dat
 196                         selections = pickle.load(open(selectionsDatPath, 'r'))
 197                         #Restoring previous selections.
 198                         #
 199                         #Make a list of categories to determine which one to select
 200                         categories = unit_data.UNIT_DESCRIPTIONS.keys()
 201                         categories.sort()
 202                         #
 203                         #If the 'selected_unts' has been stored, then extract self._selected_units from selections.
 204                         if 'selected_units' in selections:
 205                                 self._selected_units = selections['selected_units']
 206                         #Make sure that the 'self._selected_category' has been stored.
 207                         if 'selected_category' in selections:
 208                                 #Match an available category to the previously selected category.
 209                                 for counter in range(len(categories)):
 210                                         if selections['selected_category'] == categories[counter]:
 211                                                 # Restore the previously selected category.
 212                                                 self._categoryView.set_cursor(counter, self._categoryColumn, False)
 213                                                 self._categoryView.grab_focus()
 214                                 historical_catergory_found = True
 215
 216                 if not historical_catergory_found:
 217                         print "Couldn't find saved category, using default."
 218                         #If historical records were not kept then default to
 219                         # put the focus on the first category
 220                         self._categoryView.set_cursor(0, self._categoryColumn, False)
 221                         self._categoryView.grab_focus()
 222
 223                 self.restore_units()
 224
 225         def _on_shortlist_changed(self, a):
 226                 raise NotImplementedError("%s" % self._shortlistcheck.get_active())
 227
 228         def _on_edit_shortlist(self, a):
 229                 raise NotImplementedError("%s" % self._toggleShortList.get_active())
 230
 231         def _on_user_clear_selections(self, a):
 232                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 233                 os.remove(selectionsDatPath)
 234                 self._selected_units = {}
 235
 236         def _on_user_exit(self, a):
 237                 """
 238                 This routine saves the selections to a file, and
 239                 should therefore only be called when exiting the program.
 240
 241                 Update selections dictionary which consists of the following keys:
 242                 'self._selected_category': full name of selected category
 243                 'self._selected_units': self._selected_units dictionary which contains:
 244                 [categoryname: #1 displayed unit, #2 displayed unit]
 245                 """
 246                 #Determine the contents of the selected category row
 247                 selected, iter = self._categoryView.get_selection().get_selected()
 248                 self._selected_category = self._categoryModel.get_value(iter, 0)
 249
 250                 selections = {
 251                         'selected_category': self._selected_category,
 252                         'selected_units': self._selected_units
 253                 }
 254                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 255                 pickle.dump(selections, open(selectionsDatPath, 'w'))
 256
 257                 #Get last size of app and save it
 258                 window_settings = {
 259                         'size': self._mainWindow.get_size()
 260                 }
 261                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
 262                 pickle.dump(window_settings, open(windowDatPath, 'w'))
 263
 264                 gtk.mainquit
 265                 sys.exit()
 266
 267         def _on_findEntry_changed(self, a):
 268                 #Clear out find results since the user wants to look for something new
 269                 self._find_result = [] #empty find result list
 270                 self._find_count = 0 #default to find result number zero
 271                 self._findLabel.set_text('') #clear result
 272
 273         def _on_find_key_press(self, a, b):
 274                 #Check if the key pressed was an ASCII key
 275                 if len(b.string)>0:
 276                         #Check if the key pressed was the 'Enter' key
 277                         if ord(b.string[0]) == 13:
 278                                 #Execute the find units function
 279                                 self._on_user_find_units(1)
 280
 281         def _on_about_clicked(self, a):
 282                 dlg = gtk.AboutDialog()
 283                 dlg.set_name(constants.__pretty_app_name__)
 284                 dlg.set_version("%s-%d" % (constants.__version__, constants.__build__))
 285                 dlg.set_copyright("Copyright 2009 - GPL")
 286                 dlg.set_comments("")
 287                 dlg.set_website("http://unihedron.com/projects/gonvert/gonvert.php")
 288                 dlg.set_authors(["Anthony Tekatch <anthony@unihedron.com>", "Ed Page <edpage@byu.net>"])
 289                 dlg.run()
 290                 dlg.destroy()
 291
 292         def messagebox_ok_clicked(self, a):
 293                 messagebox.hide()
 294
 295         def _on_user_find_units(self, a):
 296                 #check if 'new find' or 'last find' or 'next-find'
 297
 298                 #new-find = run the find algorithm which also selects the first found unit
 299                 #         = self._find_count = 0 and self._find_result = []
 300
 301                 #last-find = restart from top again
 302                 #          = self._find_count = len(self._find_result)
 303
 304                 #next-find = continue to next found location
 305                 #           = self._find_count = 0 and len(self._find_result)>0
 306
 307                 #check for new-find
 308                 if len(self._find_result) == 0:
 309                         find_string = string.lower(string.strip(self._findEntry.get_text()))
 310                         #Make sure that a valid find string has been requested
 311                         if len(find_string)>0:
 312                                 categories = unit_data.UNIT_DESCRIPTIONS.keys()
 313                                 categories.sort()
 314                                 found_a_unit = 0 #reset the 'found-a-unit' flag
 315                                 cat_no = 0
 316                                 for category in categories:
 317                                         units = unit_data.UNIT_DESCRIPTIONS[category].keys()
 318                                         units.sort()
 319                                         del units[0] # do not display .base_unit description key
 320                                         unit_no = 0
 321                                         for unit in units:
 322                                                 if string.find(string.lower(unit), find_string) >= 0:
 323                                                         found_a_unit = 1 #indicate that a unit was found
 324                                                         #print "'", find_string, "'", " found at category = ", category, " unit = ", unit
 325                                                         self._find_result.append((category, unit, cat_no, unit_no))
 326                                                 unit_no = unit_no+1
 327                                         cat_no = cat_no+1
 328
 329                                 if found_a_unit == 1:
 330                                         #select the first found unit
 331                                         self._find_count = 0
 332                                         #check if next find is in a new category (prevent category changes when unnecessary
 333                                         if self._selected_category != self._find_result[self._find_count][0]:
 334                                                 self._categoryView.set_cursor(self._find_result[0][2], self._categoryColumn, False)
 335                                                 self._unitsView.set_cursor(self._find_result[0][3], self._unitNameColumn, True)
 336                                                 if len(self._find_result)>1:
 337                                                         self._findLabel.set_text(('Press Find for next unit. '+ str(len(self._find_result))+' result(s).'))
 338                                                 else:
 339                                                         self._findLabel.set_text('Text not found') #Display error
 340                 else: #must be next-find or last-find
 341                         #check for last-find
 342                         if self._find_count == len(self._find_result)-1:
 343                                 #select first result
 344                                 self._find_count = 0
 345                                 self._categoryView.set_cursor(self._find_result[self._find_count][2], self._categoryColumn, False)
 346                                 self._unitsView.set_cursor(self._find_result[self._find_count][3], self._unitNameColumn, True)
 347                         else: #must be next-find
 348                                 self._find_count = self._find_count+1
 349                                 #check if next find is in a new category (prevent category changes when unnecessary
 350                                 if self._selected_category != self._find_result[self._find_count][0]:
 351                                         self._categoryView.set_cursor(self._find_result[self._find_count][2], self._categoryColumn, False)
 352                                 self._unitsView.set_cursor(self._find_result[self._find_count][3], self._unitNameColumn, True)
 353
 354         def _on_click_unit_column(self, col):
 355                 """
 356                 Sort the contents of the col when the user clicks on the title.
 357                 """
 358                 #Determine which column requires sorting
 359                 if col is self._unitNameColumn:
 360                         selectedUnitColumn = 0
 361                         self._unitNameColumn.set_sort_indicator(True)
 362                         self._unitValueColumn.set_sort_indicator(False)
 363                         self._unitSymbolColumn.set_sort_indicator(False)
 364                         self._unitNameColumn.set_sort_order(not self._unit_sort_direction)
 365                 elif col is self._unitValueColumn:
 366                         selectedUnitColumn = 1
 367                         self._unitNameColumn.set_sort_indicator(False)
 368                         self._unitValueColumn.set_sort_indicator(True)
 369                         self._unitSymbolColumn.set_sort_indicator(False)
 370                         self._unitValueColumn.set_sort_order(not self._value_sort_direction)
 371                 elif col is self._unitSymbolColumn:
 372                         selectedUnitColumn = 2
 373                         self._unitNameColumn.set_sort_indicator(False)
 374                         self._unitValueColumn.set_sort_indicator(False)
 375                         self._unitSymbolColumn.set_sort_indicator(True)
 376                         self._unitSymbolColumn.set_sort_order(not self._units_sort_direction)
 377                 else:
 378                         assert False, "Unknown column: %s" % (col.get_title(), )
 379
 380                 #declare a spot to hold the sorted list
 381                 sorted_list = []
 382
 383                 #point to the first row
 384                 iter = self._unitModel.get_iter_first()
 385                 row = 0
 386
 387                 while iter:
 388                         #grab all text from columns for sorting
 389
 390                         #get the text from each column
 391                         unit_text = self._unitModel.get_value(iter, 0)
 392                         units_text = self._unitModel.get_value(iter, 2)
 393
 394                         #do not bother sorting if the value column is empty
 395                         if self._unitModel.get_value(iter, 1) == '' and selectedUnitColumn == 1:
 396                                 return
 397
 398                         #special sorting exceptions for ascii values (instead of float values)
 399                         if self._selected_category == "Computer Numbers":
 400                                 value_text = self._unitModel.get_value(iter, 1)
 401                         else:
 402                                 if self._unitModel.get_value(iter, 1) == None or unit_model.get_value(iter, 1) == '':
 403                                         value_text = ''
 404                                 else:
 405                                         value_text = float(self._unitModel.get_value(iter, 1))
 406
 407                         if selectedUnitColumn == 0:
 408                                 sorted_list.append((unit_text, value_text, units_text))
 409                         elif selectedUnitColumn == 1:
 410                                 sorted_list.append((value_text, unit_text, units_text))
 411                         else:
 412                                 sorted_list.append((units_text, value_text, unit_text))
 413
 414                         #point to the next row in the self._unitModel
 415                         iter = self._unitModel.iter_next(iter)
 416                         row = row+1
 417
 418                 #check if no calculations have been made yet (don't bother sorting)
 419                 if row == 0:
 420                         return
 421                 else:
 422                         if selectedUnitColumn == 0:
 423                                 if not self._unit_sort_direction:
 424                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(x), string.lower(y)))
 425                                         self._unit_sort_direction = True
 426                                 else:
 427                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(y), string.lower(x)))
 428                                         self._unit_sort_direction = False
 429                         elif selectedUnitColumn == 1:
 430                                 sorted_list.sort()
 431                                 if not self._value_sort_direction:
 432                                         self._value_sort_direction = True
 433                                 else:
 434                                         sorted_list.reverse()
 435                                         self._value_sort_direction = False
 436                         else:
 437                                 if not self._units_sort_direction:
 438                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(x), string.lower(y)))
 439                                         self._units_sort_direction = True
 440                                 else:
 441                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(y), string.lower(x)))
 442                                         self._units_sort_direction = False
 443
 444                         #Clear out the previous list of units
 445                         self._unitModel = gtk.ListStore(gobject.TYPE_STRING, gobject.TYPE_STRING, gobject.TYPE_STRING)
 446                         self._unitsView.set_model(self._unitModel)
 447
 448                         #colourize each row differently for easier reading
 449                         self._unitsView.set_property('rules_hint', 1)
 450
 451                         #Clear out the description
 452                         text_model = gtk.TextBuffer(None)
 453                         self._unitDescription.set_buffer(text_model)
 454
 455                         if selectedUnitColumn == 0:
 456                                 for unit, value, units in sorted_list:
 457                                         iter = self._unitModel.append()
 458                                         self._unitModel.set(iter, 0, unit, 1, str(value), 2, units)
 459                         elif selectedUnitColumn == 1:
 460                                 for value, unit, units in sorted_list:
 461                                         iter = self._unitModel.append()
 462                                         self._unitModel.set(iter, 0, unit, 1, str(value), 2, units)
 463                         else:
 464                                 for units, value, unit in sorted_list:
 465                                         iter = self._unitModel.append()
 466                                         self._unitModel.set(iter, 0, unit, 1, str(value), 2, units)
 467                 return
 468
 469         def _on_click_category(self, row):
 470                 #Clear out the previous list of units
 471                 self._unitModel = gtk.ListStore(gobject.TYPE_STRING, gobject.TYPE_STRING, gobject.TYPE_STRING)
 472                 self._unitsView.set_model(self._unitModel)
 473
 474                 #Colourize each row alternately for easier reading
 475                 self._unitsView.set_property('rules_hint', 1)
 476
 477                 #Clear out the description
 478                 text_model = gtk.TextBuffer(None)
 479                 self._unitDescription.set_buffer(text_model)
 480
 481                 #Determine the contents of the selected category row
 482                 selected, iter = row.get_selection().get_selected()
 483
 484                 self._selected_category = self._categoryModel.get_value(iter, 0)
 485
 486                 self._unit_sort_direction = False
 487                 self._value_sort_direction = False
 488                 self._units_sort_direction = False
 489                 self._unitNameColumn.set_sort_indicator(False)
 490                 self._unitValueColumn.set_sort_indicator(False)
 491                 self._unitSymbolColumn.set_sort_indicator(False)
 492
 493                 self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[selected.get_value(iter, 0)]
 494                 keys = self._unitDataInCategory.keys()
 495                 keys.sort()
 496                 del keys[0] # do not display .base_unit description key
 497
 498                 #Fill up the units descriptions and clear the value cells
 499                 for key in keys:
 500                         iter = self._unitModel.append()
 501                         self._unitModel.set(iter, 0, key, 1, '', 2, self._unitDataInCategory[key][1])
 502
 503                 self._unitName.set_text('')
 504                 self._unitValue.set_text('')
 505                 self._previousUnitName.set_text('')
 506                 self._previousUnitValue.set_text('')
 507                 self._unitSymbol.set_text('')
 508                 self._previousUnitSymbol.set_text('')
 509
 510                 self.restore_units()
 511
 512         def restore_units(self):
 513                 # Restore the previous historical settings of previously selected units in this newly selected category
 514                 #Since category has just been clicked, the list will be sorted already.
 515                 if self._selected_category in self._selected_units:
 516                         if self._selected_units[self._selected_category][0]:
 517                                 ''"debug ''"
 518                                 #self._selected_units[self._selected_category] = [selected_unit, self._selected_units[self._selected_category][0]]
 519
 520                                 units = unit_data.UNIT_DESCRIPTIONS[self._selected_category].keys()
 521                                 units.sort()
 522                                 del units[0] # do not display .base_unit description key
 523
 524                                 #Restore oldest selection first.
 525                                 if self._selected_units[self._selected_category][1]:
 526                                         unit_no = 0
 527                                         for unit in units:
 528                                                 if unit == self._selected_units[self._selected_category][1]:
 529                                                         self._unitsView.set_cursor(unit_no, self._unitNameColumn, True)
 530                                                 unit_no = unit_no+1
 531
 532                                 #Restore newest selection second.
 533                                 unit_no = 0
 534                                 for unit in units:
 535                                         if unit == self._selected_units[self._selected_category][0]:
 536                                                 self._unitsView.set_cursor(unit_no, self._unitNameColumn, True)
 537                                         unit_no = unit_no+1
 538
 539                 # select the text so user can start typing right away
 540                 self._unitValue.grab_focus()
 541                 self._unitValue.select_region(0, -1)
 542
 543         def _on_button_released(self, row, a):
 544                 self._on_click_unit(row)
 545
 546         def _on_click_unit(self, row):
 547                 self._calcsuppress = True #suppress calculations
 548
 549                 #Determine the contents of the selected row.
 550                 selected, iter = self._unitsView.get_selection().get_selected()
 551
 552                 selected_unit = selected.get_value(iter, 0)
 553
 554                 unit_spec = self._unitDataInCategory[selected_unit]
 555
 556                 #Clear out the description
 557                 text_model = gtk.TextBuffer(None)
 558                 self._unitDescription.set_buffer(text_model)
 559
 560                 enditer = text_model.get_end_iter()
 561                 text_model.insert(enditer, unit_spec[2])
 562
 563                 if self._unitName.get_text() != selected_unit:
 564                         self._previousUnitName.set_text(self._unitName.get_text())
 565                         self._previousUnitValue.set_text(self._unitValue.get_text())
 566                         if self._unitSymbol.get() == None:
 567                                 self._previousUnitSymbol.set_text('')
 568                         else:
 569                                 self._previousUnitSymbol.set_text(self._unitSymbol.get())
 570                 self._unitName.set_text(selected_unit)
 571
 572                 self._unitValue.set_text(selected.get_value(iter, 1))
 573
 574                 self._unitSymbol.set_text(unit_spec[1]) # put units into label text
 575                 if self._unitValue.get_text() == '':
 576                         if self._selected_category == "Computer Numbers":
 577                                 self._unitValue.set_text("0")
 578                         else:
 579                                 self._unitValue.set_text("0.0")
 580
 581                 #For historical purposes, record this unit as the most recent one in this category.
 582                 # Also, if a previous unit exists, then shift that previous unit to oldest unit.
 583                 if self._selected_category in self._selected_units:
 584                         if self._selected_units[self._selected_category][0]:
 585                                 self._selected_units[self._selected_category] = [selected_unit, self._selected_units[self._selected_category][0]]
 586                 else:
 587                         self._selected_units[self._selected_category] = [selected_unit, '']
 588
 589                 # select the text so user can start typing right away
 590                 self._unitValue.grab_focus()
 591                 self._unitValue.select_region(0, -1)
 592
 593                 self._calcsuppress = False #enable calculations
 594
 595         def _on_user_write_units(self, a):
 596                 ''"Write the list of categories and units to stdout for documentation purposes.''"
 597                 messagebox_model = gtk.TextBuffer(None)
 598                 messageboxtext.set_buffer(messagebox_model)
 599                 messagebox_model.insert_at_cursor(_(u'The units are being written to stdout. You can capture this printout by starting gonvert from the command line as follows: \n$ gonvert > file.txt'), -1)
 600                 messagebox.show()
 601                 while gtk.events_pending():
 602                         gtk.mainiteration(False)
 603                 category_keys = unit_data.UNIT_DESCRIPTIONS.keys()
 604                 category_keys.sort()
 605                 total_categories = 0
 606                 total_units = 0
 607                 print 'gonvert-%s%s' % (
 608                         constants.__version__,
 609                         _(u' - Unit Conversion Utility  - Convertible units listing: ')
 610                 )
 611                 for category_key in category_keys:
 612                         total_categories = total_categories + 1
 613                         print category_key, ": "
 614                         self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[category_key]
 615                         unit_keys = self._unitDataInCategory.keys()
 616                         unit_keys.sort()
 617                         del unit_keys[0] # do not display .base_unit description key
 618                         for unit_key in unit_keys:
 619                                 total_units = total_units + 1
 620                                 print "\t", unit_key
 621                 print total_categories, ' categories'
 622                 print total_units, ' units'
 623
 624         def _on_unit_value_changed(self, a):
 625                 if self._calcsuppress:
 626                         #self._calcsuppress = False
 627                         return
 628                 # determine if value to be calculated is empty
 629                 if self._selected_category == "Computer Numbers":
 630                         if self._unitValue.get_text() == '':
 631                                 value = '0'
 632                         else:
 633                                 value = self._unitValue.get_text()
 634                 else:
 635                         if self._unitValue.get_text() == '':
 636                                 value = 0.0
 637                         else:
 638                                 value = float(self._unitValue.get_text())
 639
 640                 if self._unitName.get_text() != '':
 641                         func, arg = self._unitDataInCategory[self._unitName.get_text()][0] #retrieve the conversion function and value from the selected unit
 642                         base = apply(func.to_base, (value, arg, )) #determine the base unit value
 643
 644                         keys = self._unitDataInCategory.keys()
 645                         keys.sort()
 646                         del keys[0]
 647                         row = 0
 648
 649                         #point to the first row
 650                         iter = self._unitModel.get_iter_first()
 651
 652                         while iter:
 653                                 #get the formula from the name at the row
 654                                 func, arg = self._unitDataInCategory[self._unitModel.get_value(iter, 0)][0]
 655
 656                                 #set the result in the value column
 657                                 self._unitModel.set(iter, 1, str(apply(func.from_base, (base, arg, ))))
 658
 659                                 #point to the next row in the self._unitModel
 660                                 iter = self._unitModel.iter_next(iter)
 661
 662                         # if the second row has a unit then update its value
 663                         if self._previousUnitName.get_text() != '':
 664                                 self._calcsuppress = True
 665                                 func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0]
 666                                 self._previousUnitValue.set_text(str(apply(func.from_base, (base, arg, ))))
 667                                 self._calcsuppress = False
 668
 669         def _on_previous_unit_value_changed(self, a):
 670                 if self._calcsuppress == True:
 671                         #self._calcsuppress = False
 672                         return
 673                 # determine if value to be calculated is empty
 674                 if self._selected_category == "Computer Numbers":
 675                         if self._previousUnitValue.get_text() == '':
 676                                 value = '0'
 677                         else:
 678                                 value = self._previousUnitValue.get_text()
 679                 else:
 680                         if self._previousUnitValue.get_text() == '':
 681                                 value = 0.0
 682                         else:
 683                                 value = float(self._previousUnitValue.get_text())
 684
 685                 if self._previousUnitName.get_text() != '':
 686                         func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0] #retrieve the conversion function and value from the selected unit
 687                         base = apply(func.to_base, (value, arg, )) #determine the base unit value
 688
 689                         keys = self._unitDataInCategory.keys()
 690                         keys.sort()
 691                         del keys[0]
 692                         row = 0
 693
 694                         #point to the first row
 695                         iter = self._unitModel.get_iter_first()
 696
 697                         while iter:
 698                                 #get the formula from the name at the row
 699                                 func, arg = self._unitDataInCategory[self._unitModel.get_value(iter, 0)][0]
 700
 701                                 #set the result in the value column
 702                                 self._unitModel.set(iter, 1, str(apply(func.from_base, (base, arg, ))))
 703
 704                                 #point to the next row in the self._unitModel
 705                                 iter = self._unitModel.iter_next(iter)
 706
 707                         # if the second row has a unit then update its value
 708                         if self._unitName.get_text() != '':
 709                                 self._calcsuppress = True
 710                                 func, arg = self._unitDataInCategory[self._unitName.get_text()][0]
 711                                 self._unitValue.set_text(str(apply(func.from_base, (base, arg, ))))
 712                                 self._calcsuppress = False
 713
 714
 715 def main():
 716         logging.basicConfig(level = logging.DEBUG)
 717         try:
 718                 os.makedirs(constants._data_path_)
 719         except OSError, e:
 720                 if e.errno != 17:
 721                         raise
 722
 723         gonvert = Gonvert()
 724         gtk.main()
 725
 726
 727 if __name__ == "__main__":
 728         main()